I'm against keeping anything venomous snakes with a lethal bite, but if people must do it, it should be required that:

a) The neighbourhood be notified that a venomous snake is being kept
b) Some sort of tracking device be implanted on the snake
c) Some sort of proximity sensing device and alarm that sounds off if the snake ever leaves a designated area
d) An implant with embedded tranquilizer that can be released by remote control

I'm not sure how feasible d) is, especially considering the nervous system of reptiles (is it even possible to tranquilize them?), but a) to c) are readily doable and these extra precautions, on top of responsible husbandry, would help a lot to reduce some of the risks involved in keeping venomous snakes.